This set of Separation Processes Problems focuses on “Rate-Based Methods for Packed Distillation Columns”.
1. What is λ= KV/L replaced by since the line for distillation is curved?
a) λ= mV/L
b) λ= MVL
c) λ= mL/V
d) λ= mV/K
View Answer
Explanation: Because the equilibrium line for distillation is curved, λ= KV/L is replaces by λ=mV/L where m is dy/dx.
2. Which of the following is correct?
a) HETP = H OG λ(λ-1)
b) HETP = H OG λ/(λ-1)
c) HETP = H OG /λ(λ-1)
d) HETP = H OG -λ(λ- 1)
View Answer
Explanation: HETP = H OG λ/(λ-1) is correct where λ= mV/L.
3. Which method uses McCabe-thiele diagram?
a) HETP method
b) HTU method
c) Ponchon-Savarit method
d) HODL method
View Answer
Explanation: The HETP method used McCabe-thiele diagram first.
4. What happens when k x >k y ?
a) Resistance to mass transfer is mainly in vapor
b) Resistance to mass transfer is mainly in liquid phase
c) Resistance to mass transfer is mainly in solid phase
d) All the resistances are equal
View Answer
Explanation: When k x >k y resistance to mass transfer is mainly in vapor.
5. What happens when k x <k y ?
a) Resistance to mass transfer is mainly in vapor
b) Resistance to mass transfer is mainly in liquid phase
c) Resistance to mass transfer is mainly in solid phase
d) All the resistances are equal
View Answer
Explanation: When k x <k y resistance to mass transfer is mainly in liquid phase.
6. In which solution are the values of HTU and HETP constant?
a) Concentrated solution
b) True solution
c) Homogeneous solution
d) Dilute solution
View Answer
Explanation: The values of HTU and HETP are constant in dilute solution.
7. What is HETP if H OG = 1.5ft and λ=01.5?
a) 1.23
b) 1.43
c) 1.65
d) 1.78
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 1.5ln(1.5/(1.5-1))= 1.65.
8. What is HETP if H OG = 2.5ft and λ=01.5?
a) 1.23
b) 1.78
c) 1.26
d) 2.74
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 2.5ln(1.5/(1.5-1))= 2.74.
9. What is HETP if H OG = 1.7ft and λ=1.9?
a) 1.27
b) 1.36
c) 1.89
d) 1.78
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 1.7ln(1.9/(1.9-1))= 1.27.
10. What is HETP if H OG = 2.6ft and λ=01.6?
a) 1.56
b) 2.1
c) 2.55
d) 1.78
View Answer
Explanation: Since HETP = H OG λ/(λ-1), HETP = 2.6ln(1.6/(1.6-1))= 2.55.
Sanfoundry Global Education & Learning Series – Separation Processes.
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